Hydrodynamic functionality of the lorica in choanoflagellates

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Abstract

Choanoflagellates are unicellular microswimmers that are ubiquitous in aquatic habitats. They have a single flagellum that creates a flow toward the collar, the filtration apparatus composed of closely spaced filter strands. Loricate choano flagellates have evolved a basket-like “skeleton” around the cell, the lorica, the function of which remains unknown. Here,we use Computational Fluid Dynamics (CFD) to explore the possible hydrodynamic function of the lorica by studying the choanoflagellate Diaphaoneca grandis, with and without its lorica. We study the flow rate, the flow recirculation, and the resulting clearance rate for the capture of motile and non-motile prey by the freely swimming choanoflagellate. We find no support for several previous hypotheses regarding the effects of the lorica. Rather, our simulations suggest that the main function of the lorica is to enhance the capture efficiency, but this happens at the cost of lower encounter rate with motile prey.
Original languageEnglish
Publication date2018
Number of pages1
Publication statusPublished - 2018
Event71st Annual Meeting of the APS Division of Fluid Dynamics - Georgia World Congress Center , Atlanta, United States
Duration: 18 Nov 201820 Nov 2018

Conference

Conference71st Annual Meeting of the APS Division of Fluid Dynamics
LocationGeorgia World Congress Center
CountryUnited States
CityAtlanta
Period18/11/201820/11/2018

Cite this

Walther, J. H., Asadzadeh, S. S., Nielsen, L. T., Andersen, A., Dölger, J., Kiørboe, T., & Larsen, P. S. (2018). Hydrodynamic functionality of the lorica in choanoflagellates. Abstract from 71st Annual Meeting of the APS Division of Fluid Dynamics , Atlanta, United States.
Walther, Jens Honore ; Asadzadeh, Seyed Saeed ; Nielsen, Lasse Tor ; Andersen, Anders ; Dölger, Julia ; Kiørboe, Thomas ; Larsen, Poul Scheel. / Hydrodynamic functionality of the lorica in choanoflagellates. Abstract from 71st Annual Meeting of the APS Division of Fluid Dynamics , Atlanta, United States.1 p.
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title = "Hydrodynamic functionality of the lorica in choanoflagellates",
abstract = "Choanoflagellates are unicellular microswimmers that are ubiquitous in aquatic habitats. They have a single flagellum that creates a flow toward the collar, the filtration apparatus composed of closely spaced filter strands. Loricate choano flagellates have evolved a basket-like “skeleton” around the cell, the lorica, the function of which remains unknown. Here,we use Computational Fluid Dynamics (CFD) to explore the possible hydrodynamic function of the lorica by studying the choanoflagellate Diaphaoneca grandis, with and without its lorica. We study the flow rate, the flow recirculation, and the resulting clearance rate for the capture of motile and non-motile prey by the freely swimming choanoflagellate. We find no support for several previous hypotheses regarding the effects of the lorica. Rather, our simulations suggest that the main function of the lorica is to enhance the capture efficiency, but this happens at the cost of lower encounter rate with motile prey.",
author = "Walther, {Jens Honore} and Asadzadeh, {Seyed Saeed} and Nielsen, {Lasse Tor} and Anders Andersen and Julia D{\"o}lger and Thomas Ki{\o}rboe and Larsen, {Poul Scheel}",
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note = "71st Annual Meeting of the APS Division of Fluid Dynamics ; Conference date: 18-11-2018 Through 20-11-2018",

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Walther, JH, Asadzadeh, SS, Nielsen, LT, Andersen, A, Dölger, J, Kiørboe, T & Larsen, PS 2018, 'Hydrodynamic functionality of the lorica in choanoflagellates', 71st Annual Meeting of the APS Division of Fluid Dynamics , Atlanta, United States, 18/11/2018 - 20/11/2018.

Hydrodynamic functionality of the lorica in choanoflagellates. / Walther, Jens Honore; Asadzadeh, Seyed Saeed; Nielsen, Lasse Tor; Andersen, Anders; Dölger, Julia; Kiørboe, Thomas; Larsen, Poul Scheel.

2018. Abstract from 71st Annual Meeting of the APS Division of Fluid Dynamics , Atlanta, United States.

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

TY - ABST

T1 - Hydrodynamic functionality of the lorica in choanoflagellates

AU - Walther, Jens Honore

AU - Asadzadeh, Seyed Saeed

AU - Nielsen, Lasse Tor

AU - Andersen, Anders

AU - Dölger, Julia

AU - Kiørboe, Thomas

AU - Larsen, Poul Scheel

PY - 2018

Y1 - 2018

N2 - Choanoflagellates are unicellular microswimmers that are ubiquitous in aquatic habitats. They have a single flagellum that creates a flow toward the collar, the filtration apparatus composed of closely spaced filter strands. Loricate choano flagellates have evolved a basket-like “skeleton” around the cell, the lorica, the function of which remains unknown. Here,we use Computational Fluid Dynamics (CFD) to explore the possible hydrodynamic function of the lorica by studying the choanoflagellate Diaphaoneca grandis, with and without its lorica. We study the flow rate, the flow recirculation, and the resulting clearance rate for the capture of motile and non-motile prey by the freely swimming choanoflagellate. We find no support for several previous hypotheses regarding the effects of the lorica. Rather, our simulations suggest that the main function of the lorica is to enhance the capture efficiency, but this happens at the cost of lower encounter rate with motile prey.

AB - Choanoflagellates are unicellular microswimmers that are ubiquitous in aquatic habitats. They have a single flagellum that creates a flow toward the collar, the filtration apparatus composed of closely spaced filter strands. Loricate choano flagellates have evolved a basket-like “skeleton” around the cell, the lorica, the function of which remains unknown. Here,we use Computational Fluid Dynamics (CFD) to explore the possible hydrodynamic function of the lorica by studying the choanoflagellate Diaphaoneca grandis, with and without its lorica. We study the flow rate, the flow recirculation, and the resulting clearance rate for the capture of motile and non-motile prey by the freely swimming choanoflagellate. We find no support for several previous hypotheses regarding the effects of the lorica. Rather, our simulations suggest that the main function of the lorica is to enhance the capture efficiency, but this happens at the cost of lower encounter rate with motile prey.

M3 - Conference abstract for conference

ER -

Walther JH, Asadzadeh SS, Nielsen LT, Andersen A, Dölger J, Kiørboe T et al. Hydrodynamic functionality of the lorica in choanoflagellates. 2018. Abstract from 71st Annual Meeting of the APS Division of Fluid Dynamics , Atlanta, United States.